Yaesu FT-991 S-meter calibration table HF/50MHz
July 20, 2015, Ta= +27oC.
FT-991 S/N: 5G120045. FT-991 FIRMWARE: MAIN: V01-13, DSP: V01-02, TFT: V01-02, C4FM: V02-10.
Rhode&Schwarz Signal Generator SMUV 301.012052,HP/Agilent coaxial attenuators: HP8491A, HP11708A, fixed attenuators, 10, 20, 30dB.
Frequency: 3530 KHz, BW= 500Hz, CW-U, IPO-AMP1 (correct readings). S-meter - factory adjustment.
Yaesu FT-991 S-meter calibration table HF (1.8 - 28 MHz)
Input Level [dBm] |
S-meter standard [mV/µV] |
S-meter readings |
FT-991 S-meter readings |
S-meter Error [dB] |
7.0 | Not applicable | S9+80 | Not applicable | - |
-3 | Not applicable | S9+70 | Not applicable | - |
-13 | 50mV | S9+60 | S9+60 / out of range (>60) |
+5 dB |
-23 | 15.81mV | S9+50 | S9+55 | +5 dB |
-33 | 5.00mV | S9+40 | S9+47 | +7 dB |
-43 | 1.581mV | S9+30 | S9+33 | +3 dB |
-53 | 500µV | S9+20 | S9+25 | +5 dB |
-63 | 158.1µV | S9+10 | S9+15 | +5 dB |
-73 | 50.15µV | S9 | S9+4dB | +4 dB |
-79 | 25.13µV | S8 | S8.2 | +1 dB |
-85 | 12.6µV | S7 | S6.8 | -1 dB |
-91 | 6.31µV | S6 | S4.5 | -9 dB |
-97 | 3.16µV | S5 | S2 | -18 dB |
-103 | 1.59µV | S4 | S1 | -20 dB |
-109 |
0.79µV | S3 | no deflection | - |
-115 | 0.4µV | S2 | no deflection | - |
-121 | 0.2µV | S1 | no deflection | - |
-127 | 0.1µV | S0 | no deflection | - |
July 20, 2015, Ta= +26oC.
FT-991 S/N: 5G120045. FT-991 FIRMWARE: MAIN: V01-13, DSP: V01-02, TFT: V01-02, C4FM: V02-10.
Rhode&Schwarz Signal Generator SMUV 301.012052,HP/Agilent coaxial attenuators: HP8491A, HP11708A, fixed attenuators, 10, 20, 30dB.
Frequency: 50100 KHz, BW= 500Hz, CW-U, IPO-AMP2 (correct readings). S-meter - factory adjustment.
Yaesu FT-991 S-meter calibration table 50MHz
Input Level [dBm] |
S-meter standard [mV/µV] |
S-meter readings |
FT-991 S-meter readings |
S-meter Error [dB] |
-13 | Not applicable | S9+80 | Not applicable | - |
-23 | Not applicable | S9+70 | Not applicable | - |
-33 | 500µV | S9+60 | S9+60 |
+0 dB |
-43 | 158.1µV | S9+50 | S9+48 | -2 dB |
-53 | 50.0µV | S9+40 | S9+36 | -4 dB |
-63 | 15.81µV | S9+30 | S9+28 | -2 dB |
-73 | 5.00µV | S9+20 | S9+18 | -2 dB |
-83 | 15.81µV | S9+10 | S9+8 | -2 dB |
-93 | 5.015µV | S9 | S8.5 | -3 d B |
-99 | 2.513µV | S8 | S6.8 | -6.5 dB |
-105 | 1.26µV | S7 | S5 | -12 dB |
-111 | 0.631µV | S6 | S2.2 | -22 dB |
-117 | 0.316µV | S5 | <S1 | -25 dB |
-123 | 0.159µV | S4 | no deflection | - |
-129 |
79nV | S3 | no deflection | - |
-135 | 40nV | S2 | no deflection | - |
-141 | 20nV | S1 | no deflection | - |
-147 | 10nV | S0 | no deflection | - |
SP5ELA
Warszawa, July 20, 2015